/*
 * Copyright (C) 2022 Block, Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package app.cash.zipline

/**
 * A function defined on an interface that extends [ZiplineService] and that may be bridged.
 */
interface ZiplineFunction<T : ZiplineService> {
  /**
   * A unique id for this function. By default this is the first 6 bytes of the SHA-256 of the
   * function's signature, base64-encoded.
   *
   * These are sample values that correspond to the sample values in [signature].
   *
   *  * "PnpfScGS"
   *  * "TTdM8O+x"
   *  * "o+Bha3Rq"
   *  * "qr+8pXgn"
   */
  val id: String

  /**
   * Returns a string that uniquely identifies this function. Parameter names are omitted. Parameter
   * types are fully-qualified.
   *
   * These are sample values:
   *
   *  * "var count: kotlin.Int"
   *  * "val count: kotlin.Int"
   *  * "fun echo(request: EchoRequest): EchoResponse"
   *  * "suspend fun echo(request: EchoRequest): EchoResponse"
   */
  val signature: String

  /** True if this function completes asynchronously. */
  val isSuspending: Boolean

  /** True if this function is [ZiplineService.close]. */
  val isClose: Boolean
}
